Stair-routing machine.



PATENTED SEPT. .18

S. P. WOOLF.

STAIRROUTING MACHINE.

APPLICATIQN FILED MAR.15, 1905.

UNITED STATES PATENT OFFICE.

STAIR-ROUTING MACHINE.

Specification of Letters Patent.

Patented Sept. 18, 1906.

Application filed March 15, 1905. Serial No. 250,302.

To aZZ whom it may concern.-

Be it known that I, SILAS PAUL WOOLF, a citizen of the United States, residing at No. 2622 Corby street, Omaha, in the county of Douglas and State of Nebraska, have invented a new and useful Stair-Routing Machine, of which the following is a specification.

My invention is an improvement in stair routing machines; and it consists in certain novel constructions and combinations of parts hereinafter described and claimed.

Referring to the drawings forming a part hereof, Figure 1 is a perspective view of the frame for supporting and guiding the cutting-bit. Fig. 2 is a front elevation of the carriage and mechanism connected therewith, the frame being shown in section. Fig. 3 is a side view of the carriage and mechanism connected therewith, and Fig. 4 is a bottom plan view of the cutting-bit.

In the practical application of my invention I provide a support comprising upper and lower rectangular frames A and B. The lower frame A comprises the longitudinal bars a, connected at the ends by the crossbars a and having at each of its corners upwardly-projecting screw-threaded bolts a The upper frame B comprises the longitudinal bars I), provided with the inwardly-facing grooves 11, the longitudinal bars being connected at their ends by the crossbars b and the corners of the frame being provided with holes for receiving the screw-threaded bolts. The frames are placed upon the stair-stringer H, the frames being secured together by wing-nuts b engaging the screw-threaded ends of the bolts.

A carriage C is slidably mounted in the upper frame, the carriage being provided with tongues c, engaging the grooves b and having in the front end thereof a bearing 0, in which is journaled a vertical shaft D. The lower end of the shaft D is provided with a cuttingbit E, and the upper end is provided with a bevel-gear (V, the shaft being retained in the bearingby collars d d above and below the bearing, respectively. An inclined shaft G, provided at its outer or lower end with a bevel-gear g, meshing with the bevel-gear d is journaled in a bracket 0 projecting upwardly from the carriage, the shaft being retained in the bracket by a collar g and the inner or upper end thereof being squared, as at'g, for the reception of a brace-chuck.

In operation, the supporting-frames being clamped upon the stringer, the carriage is adjusted in proper position, and the bracechuck is applied to the upper end of the inclined shaft. The pressure of the shoulder against the end of the brace-chuck tends to drive the bit forward, While at the same time exerting a downward force thereon to hold it more firmly in the groove which it cuts. It will be seen that by inclining the driving shaft the pressure upon the brace is made to serve a double purposethat of driving the bit forward and of holding it to the work.

. The bit is shown as aiive-point bit, the cutters slanting from the bottom upward and inclined toward the shaft and the lower edge of each cutter being provided with a point standing at approximately a right angle with the cutter. The points out the grain of the wood in advance of the cutters, and by providing five cutters it will be evident that when one cutter is just leaving the work the succeeding cutter is at full out, while the third is just entering. The cutting being continuous, a smooth and easy running bit is the result.

I claim- 1. In a stair-routing machine and in combination, a plurality of rectangular frames comprising the longitudinal and cross bars, screw-threaded bolts at the corners of the lower frame and traversing the opening in the upper frame, wing-nuts engaging the bolts,

the longitudinal bars of the upper frame being provided with grooves, a carriage mounted in the grooves and provided with an upwardly-extending bracket, an inclined spindle journaled in the bracket and provided at its upper end with a squared portion, a gearwheel on the lower end of the spindle, a vertical shaft j ournaled in the carriage, a bevelgear on the'upper end thereof and meshing with the bevel-gear on the spindle, and a bit on the lower end of the vertical shaft.

2. In a stair-routing machine, the combination with upper and lower rectangular frames for engaging the stringer, and means for securing the frames together, of a carriage slidably mounted in the upper plate, a vertical shaft journaled in the carriage, a cutting-bit on the lower end of the shaft, means for driving the shaft, said driving means being inclined from the direction of travel of the carriage.

3. In a stair-routing machine, the combination with upper and lower rectangular frames for engaging the stringer and means for securing the frames together, of a carriage slidably mounted on the frame, a verticallyarranged cutting-bit on the carriage, and means for driving the cutting-bit, said-driv' ing means being inclined from the d rection of travel'of the carriage.

4. In a stair-routing machine, the combi' nation with a carriageand a support: there-'- for, of a cutting-bit journaled vertically in the carriage, and means for driving the bit, said driving means. being inclined upwardly and away from the direction oftravel of the l carriage, whereby pressure applied to said driving means will hold the cutter to its work and move the carriage forward;

5. In a stair-routing machine; the combinationwith asliding carriage, of a cutting-bit journaledver-tically therein, and means for driving the cutting-bit, said driving means being inclined upwardly and away from the direction of travel of the carriage, whereby pressure applied to said drivingmeans-will hold the cutter to its Work and move the carriage forward.

SILASSPAUL WO OIjF.

Witnesses :i

CHARLES-v ELLSWORTIL MORGAN, ALFRED a BERRY. DAY-1st; 

